"Riveting. In Once and Future Giants, Sharon Levy brings the prehistoric world vividly-awesomely-to life, unearthing essential insights into the fate of nature."
-Alan Burdick, author of Out of Eden: An Odyssey of Ecological Invasion


"Lions and Tigers and Bears, Oh My! Sharon Levy's thought-provoking book takes us on a journey through the vanished worlds of now-extinct megafauna and assesses the role of humans in contributing to their disappearance. Anyone interested in the conservation of the remaining large wild animals on earth should read this timely essay."
-Brian Fagan, Emeritus Professor of Anthropology, University of California, Santa Barbara, and author of The Great Warming: Climate Change and the Rise and Fall of Civilizations


"The latest science indicates that understanding how large mammals moved around our continents may play a major role in addressing our carbon problems-this book offers, among many other fascinating insights, an idea of how that might work."
-Bill McKibben, author of Eaarth: Making a Life on a Tough New Planet

"Once and Future Giants is a fascinating, timely, and excellent book.  A real page-turner, and a great example of popular science writing--I plan to use it in my teaching."
-Warren Allmon, Paleontological Research Institution and Cornell University